Wrench



(Np Model.)

A.- NELSON.

WRENCH.

Patented Nov. 15,1881. I

UNITED STATES PATENT ()FFICEO AUGUST NELSON, OF KENT, OHIO.

WRENCH.

I SPECIFICATION forming part of Letters Patent No. 249,477, dated November 15, 1881.

V Application filed May 12, 1881. (No model.)

To all .whom it may concern Be it known that I, AUGUST NELSON, of Kent, Portage county, Ohio, have invented a new and useful Improvemeht in Wrenches, of

i which the following is a specification.

The nature and object of my invention are a stop or spring-catch, in combination with the adjusting-screw which operates the movable jaw of the wrench for the purpose of locking the screw when thejaw has been adjusted.

In the drawings, forming a part of this specification, Figure l is an elevation. Fig. 2 is a cross-section, on an enlarged scale, at the dotted line in Fig. 1. Fig. 3 is a sectional view representing the spring-stop on an enlarged scale.

- The movable jaw b of the ordinary monkeywrench, represented by Fig. l, is adjusted toward and from the stationary jaw b by turning screw a in the movable jaw, which is provided with a female screw to receive screw a. The head a of screw a is cylindrical and pivoted in the abntmentgot'handle h.. The spring catch or stop 8 is pivoted on pin 0, (shown by dotted lines in Fig. 1,) which is firmly inserted in the end of handle h. One end of stop sis firmly held against the circumference of screwliead a by spring 0.

Itis preferable that the circumference of screw-head a should be slightly toothed or furrowed, (as it usually is in this class of monkeywrenches,) so that the end of stop 8 may enter the furrows, and thereby prevent the turning of screw a more effectually than by the simple friction of the stop on a screw-head having a smooth circumferential surface.

Spring 0 is doubled or'bent over pin 6 between the ears 8 of stop 8, the lower part of the spring resting on the bar d of the wrench, and the upper part pressing against the under side of stop 8, as shown in Figs. 2 and 3.

In adjusting the movable jaw 12 by turning screw a the screw-head a should first be released from stop 8 by pressing the thumb or finger on the stop. When the movablejaw has been properly adjusted, then by removing the pressure of" the finger on the stop 8 the reaction of the compressed spring 0 forces the end of stop .9 down on screw-head a to retain it in position. g

I claim as my invention- In a wrench having one of its jaws actuated by a screw, the combination, with the milled head of said screw, of the sprin g-stop 8, attached to the part carrying the stationary jaw of the wrench, substantially as and for the purpose set forth.

AUGUST NELSON. 

